๐ Normal
PRIMARY INDICATIONS
1๐ Trauma patient unable to stand or sit upright
2๐ Evaluation of posterior pneumothorax
3๐ Assessment of pleural air–fluid levels
PNEUMOTHORAX
4๐ Occult pneumothorax (posterior air collection)
5๐ Posterior pneumothorax
6๐ Tension pneumothorax (anterior displacement of mediastinum)
PLEURAL EFFUSION & HEMOTHORAX
7๐ Layering pleural effusion
8๐ Hemothorax (posterior dependent fluid)
9๐ Hydropneumothorax (horizontal air–fluid level)
LUNG PARENCHYMAL FINDINGS
10๐ Posterior lung contusion
11๐ Dependent atelectasis
12๐ Aspiration changes (posterior segments)
MEDIASTINAL & DIAPHRAGMATIC FINDINGS
13๐ Retrocardiac pathology
14๐ Posterior mediastinal hematoma
15๐ Diaphragmatic contour abnormality
SKELETAL & CHEST WALL INJURIES
16๐ Posterior rib fractures
17๐ Thoracic spine fractures
18๐ Scapular fractures
DEVICES & TUBES
19๐ Chest tube posterior positioning
20๐ Endotracheal tube depth (limited assessment)
LIMITATIONS & PITFALLS
21๐ Limited lung field coverage
22๐ Patient rotation affecting interpretation
23๐ Inferior image quality compared to CT
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